A US-French satellite that will map almost all of the world's oceans, lakes and rivers has rocketed into orbit.he pre-dawn launch aboard a SpaceX rocket from Vandenberg Space Force Base in California capped a highly successful year for Nasa.Nicknamed SWOT - short for Surface Water and Ocean Topography - the satellite is needed more than ever as climate change worsens droughts, flooding and coastal erosion, according to scientists.
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